My grandfather was called Sidney but, was known by his second name of Arthur. He was born in November 1907 in Chatteris, and had a couple of brothers called Harry and George (there may have been more my father can't remember) and a couple of sisters one of which was called Phylis. My Great Grandfathers name was William.
We don't live too far away as I'm from Kings Lynn, so maybe somewhere along the line we're related!!!